Counterfeit preventing structure and counterfeit preventing article
a technology of structure and counterfeit, applied in the field of counterfeit preventing structure and counterfeit preventing article, can solve the problems of difficult to obtain holographic optical elements, difficult to copy optical elements, and unauthorized reproduction
Inactive Publication Date: 2017-07-20
TOPPAN PRINTING CO LTD
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- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The patent describes a way to make a structure that prevents counterfeiting. This structure has special optical effects that can be easily observed with the naked eye. This helps to verify the authenticity of the structure.
Problems solved by technology
Unauthorized reproduction can be prevented, since these elements are difficult to be analyzed due to their micro structures or complicated layer constructions.
More difficult-to-copy holographic optical elements can be obtained by patterning this reflective layer.
This optical element is considered to be difficult to copy, due to higher complexity and higher definition.
However, the pattern of high definition which is difficult to copy can be detected only by observation under a magnifying glass.
It is difficult to confirm the effect of the pattern by observation by the naked eye.
Method used
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example 1
[0092]To a transparent polyethylene terephthalate film having a thickness of 23 μm was applied an ink composition (“RL-9” manufactured by KSM Co., Ltd.) by gravure printing, to obtain a coating having a thickness of 1 μm after drying.
[0093]Subsequently, a cylindrical master having a reversed shape of the desirable micro-protrusions and micro-depressions was moved at a rate of 10 m / minute, and pressed to the coating under a pressure of 2 kgf / cm2 (about 0.2 MPa) at a temperature of 80° C., to transfer micro-protrusions and micro-depressions. Simultaneously with transferring, the coating is irradiated with ultraviolet light emitted from a high-pressure mercury lamp through a polyethylene terephthalate for cuing the coating to which the micro-protrusions and micro-depressions had been transferred, to obtain first color-adjusting layer 10. The energy density of the ultraviolet light was 300 mJ / cm2. The resultant micro-protrusions and micro-depressions had a grid structure consisting of a...
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The objective of the present invention is to provide a counterfeit preventing structure which has an effect that can be confirmed by observation with the naked eye and has different optical effects on the front and back. This counterfeit preventing structure includes a micro-protrusion / depression reflective surface having a first surface that has micro-protrusions and micro-depressions and a second surface that has micro-protrusions and micro-depressions opposite to the first surface, a first color-adjusting layer that is provided on at least partial region(s) of the first surface and in contact with the first surface, and a second color-adjusting layer that is provided on at least partial region(s) of the second surface and in contact with the second surface, the first surface and second surface having micro-protrusion / depression surfaces that generate structural color by reflecting, interfering with, diffracting, scattering, and / or absorbing light from at least a portion of the visible region, wherein the difference between the refractive index of the first color-adjusting layer and the refractive index of the second color-adjusting layer is 0.1 or more. This counterfeit preventing structure makes it possible to obtain optical effects that are different under observation from a first color-adjusting layer side and a second color-adjusting layer side.
Description
TECHNICAL FIELD[0001]The present invention relates to counterfeit preventing structures and counterfeit preventing articles, which have special optical effects.BACKGROUND ART[0002]It is known to prevent from counterfeiting articles which prevention of counterfeiting is required, such as securities, certificates, and articles of upscale labels, by adhering an element having difficult-to-copy optical effects. Holograms, diffraction gratings, and multilayer interference films are known as the elements having such optical effects. Unauthorized reproduction can be prevented, since these elements are difficult to be analyzed due to their micro structures or complicated layer constructions.[0003]Further, it is known to form a reflective layer in the above-described holograms and the like is known for enhancing the optical effects. More difficult-to-copy holographic optical elements can be obtained by patterning this reflective layer. For example, the holographic element having the patterne...
Claims
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IPC IPC(8): B42D25/328B42D25/24G02B1/14B42D25/378G02B5/02B42D25/23B42D25/29
CPCB42D25/328B42D25/23B42D25/24G02B1/14B42D25/378G02B5/0221G02B5/0284B42D25/29G02B5/18G02B5/0215B42D25/373B42D25/30
Inventor YASHIKI, KAZUHIRO
Owner TOPPAN PRINTING CO LTD